Table 2 Comparison of distribution for pedicle screw misplacement in the PPS side and the open side
Categorical variable | P-side | O-side | P-value | |
|---|---|---|---|---|
Adequate insertion (%) | 349 (91.1) | 346 (90.5) | ||
Misplacement (%) | 34 (8.9) | 37 (9.5) | NS | |
Penetration (%) | Minor | 28 (7.3) | 32 (8.4) | NS |
Moderate | 5 (1.3) | 4 (1.0) | NS | |
Severe | 1 (0.3) | 1 (0.3) | NS | |
Direction | Inferior | 2 | 1 | NS |
Superior | 2 | 1 | NS | |
Medial | 22 | 23 | NS | |
Lateral | 8 | 12 | NS | |
Level | L2 | 1 | 1 | NS |
L3 | 3 | 5 | NS | |
L4 | 18 | 15 | NS | |
L5 | 8 | 15 | NS | |
S1 | 4 | 1 | NS | |